The nurse is teaching a class on muscular coordination and explains it is the movement of what electrolyte that contributes to the process of muscle contraction and relaxation?
Magnesium.
Chloride.
Calcium.
Hydrogen.
The Correct Answer is C
Choice A rationale
Magnesium plays a role in muscle relaxation but is not primarily responsible for muscle contraction. It helps in stabilizing the muscle membrane by acting as a natural calcium blocker. Deficiency in magnesium can lead to muscle cramps and spasms, but it does not directly cause muscle contraction and relaxation processes.
Choice B rationale
Chloride is an essential electrolyte involved in maintaining fluid balance and acid-base balance, but it does not directly influence muscle contraction and relaxation. It works in conjunction with sodium to regulate osmotic pressure and acid-base balance.
Choice C rationale
Calcium is crucial for muscle contraction. It is released from the sarcoplasmic reticulum within the muscle cells and binds to troponin, causing a conformational change that allows actin and myosin to interact and generate contraction. During relaxation, calcium ions are pumped back into the sarcoplasmic reticulum.
Choice D rationale
Hydrogen ions are involved in pH balance and acid-base regulation but do not directly affect muscle contraction and relaxation. Excess hydrogen ions (acidosis) can impair muscle function, but they are not the primary factor in muscle contraction processes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
While a complete blood count (CBC) is an essential lab value for monitoring many conditions and potential side effects, it is not the primary concern when administering high doses of azithromycin, especially with co-administration of acetaminophen. The focus should be on liver function.
Choice B rationale
Urinalysis is useful in diagnosing and monitoring various conditions but is not directly relevant to monitoring the side effects of azithromycin and acetaminophen. These medications do not typically cause urinary abnormalities that would necessitate frequent urinalysis.
Choice C rationale
Electrolytes are not directly affected by azithromycin and acetaminophen use. Although monitoring electrolytes can be essential in broader contexts, these specific medications do not primarily impact electrolyte balance requiring focused monitoring.
Choice D rationale
Liver enzymes are the key lab values to monitor when administering high doses of azithromycin and acetaminophen. Both medications are metabolized by the liver and can cause hepatotoxicity. Monitoring liver enzymes helps in detecting early signs of liver damage and preventing further complications.
Correct Answer is A
Explanation
Choice A rationale
True, because antitussive agents, which are cough suppressants, can potentially lead to dependence due to their central nervous system effects. This risk is particularly concerning for patients with a history of addiction.
Choice B rationale
False, is incorrect because the potential for addiction does warrant caution when prescribing antitussive agents to patients with a history of addiction. .
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